[1] Cid tried several jobs but his career as a caricaturist and a cartoonist only took off after the Carnation Revolution of 25 April 1974 when the censorship imposed by the Estado Novo dictatorship was lifted.

Later he published in newspapers such as O Diabo, O Independente, Grande Reportagem and Semanário, a weekly journal founded by, among others, the present president of Portugal, Marcelo Rebelo de Sousa.

Despite the lifting of censorship, two of his books, O Superman and Eanito, el Estático, both poking fun at António Ramalho Eanes who was the president between 1976 and 1986, were seized as a result of court orders.

[1][2][3] In addition to his artistic work, he was noted for his commitment to identifying the causes of the 1980 Camarate plane crash in which the president, Francisco de Sá Carneiro and Adelino Amaro da Costa, the first civilian defence minister after the revolution, were killed.

As a sculptor, he sculpted a tribute to the victims of the September 11 attacks in New York City in 2001, which is to be found in Lisbon at the intersection of the Avenida de Roma and the Avenida dos Estados Unidos da América; a statue in honour of Nuno Álvares Pereira a 14th-century Portuguese general, who played a major role in ensuring the independence of Portugal from Spain; and a statue in Funchal, Madeira of João Gonçalves Zarco, an early explorer.